Public bug reported: SRU Justification
Impact: Currently shiftfs does not handle O_DIRECT if the underlay supports it. This is blocking dqlite - an essential part of LXD - from profiting from the performance benefits of O_DIRECT on suitable filesystems when used with async io such as aio or io_uring. Regression Potential: Limited to shiftfs and virtually none since we have not supported this feature before. Test Case: Run LXD with dqlite on a kernel that has support for shiftfs with O_DIRECT. Target Kernels: All LTS kernels with shiftfs support. Patches: https://github.com/brauner/ubuntu-disco/tree/shiftfs_direct_io ** Affects: linux (Ubuntu) Importance: Undecided Assignee: Christian Brauner (cbrauner) Status: Confirmed ** Changed in: linux (Ubuntu) Status: New => Confirmed ** Changed in: linux (Ubuntu) Assignee: (unassigned) => Christian Brauner (cbrauner) -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1837223 Title: shiftfs: add O_DIRECT support Status in linux package in Ubuntu: Confirmed Bug description: SRU Justification Impact: Currently shiftfs does not handle O_DIRECT if the underlay supports it. This is blocking dqlite - an essential part of LXD - from profiting from the performance benefits of O_DIRECT on suitable filesystems when used with async io such as aio or io_uring. Regression Potential: Limited to shiftfs and virtually none since we have not supported this feature before. Test Case: Run LXD with dqlite on a kernel that has support for shiftfs with O_DIRECT. Target Kernels: All LTS kernels with shiftfs support. Patches: https://github.com/brauner/ubuntu-disco/tree/shiftfs_direct_io To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1837223/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
